How to determine the domain of addition of two rational functions

The video tutorial discusses the domain restrictions of a function, identifying values that make the function undefined, specifically x cannot equal 0 or 3. It explains the continuity of the function across different intervals and provides a graphical representation of these concepts. The function is continuous from negative infinity to zero, zero to three, and three to infinity, with disconnections at the points where x equals 0 and 3.

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